This study investigates the use of glass fiber-reinforced polyester (GRP) pipe powder (PP) for improving the bearing capacity of sandy soils. After a series of direct share tests, the optimum PP addition for improving the bearing capacity of soils was found to be 12%. Then, using the optimum PP addition, the bearing capacity of the soil was estimated through a series of loading tests on a shallow foundation model placed in a test box. The bearing capacity of sandy soil was improved by up to 30.7%. The ratio of the depth of the PP-reinforced soil to the diameter of the foundation model (H/D) of 1.25 could sufficiently strengthen sandy soil when the optimum PP ratio was used. Microstructural analyses showed that the increase in the bearing capacity can be attributed to the chopped fibers in the PP and their multiaxial distribution in the soil. Besides improving the engineering properties of soils, using PP as an additive in soils would reduce the accumulation of the industrial waste, thus providing a twofold benefit.

本研究调查了使用玻璃纤维增​​强聚酯 (GRP) 管粉 (PP) 来提高沙质土壤的承载力。经过一系列的直接共享试验，发现提高土壤承载力的最佳 PP 添加量为 12%。然后，使用最佳 PP 添加量，通过在放置在测试箱中的浅地基模型上进行的一系列加载测试来估算土壤的承载能力。砂质土壤承载力提高达30.7%。PP加筋土的深度与地基模型直径的比值（H/D) 为 1.25 时，当使用最佳 PP 比例时，可以充分强化沙质土壤。微观结构分析表明，承载能力的增加可归因于 PP 中的短切纤维及其在土壤中的多轴分布。除了改善土壤的工程性质外，在土壤中使用聚丙烯作为添加剂可以减少工业废物的积累，从而提供双重好处。